Postcode areas 57XXX
- Postcode area 57072 Siegen
- Postcode area 57074 Siegen
- Postcode area 57076 Siegen
- Postcode area 57078 Siegen
- Postcode area 57080 Siegen
- Postcode area 57223 Kreuztal
- Postcode area 57234 Wilnsdorf
- Postcode area 57250 Netphen
- Postcode area 57258 Freudenberg
- Postcode area 57271 Hilchenbach
- Postcode area 57290 Neunkirchen
- Postcode area 57299 Burbach
- Postcode area 57319 Bad Berleburg
- Postcode area 57334 Bad Laasphe
- Postcode area 57339 Erndtebrück
- Postcode area 57368 Lennestadt
- Postcode area 57392 Schmallenberg
- Postcode area 57399 Kirchhundem
- Postcode area 57413 Finnentrop
- Postcode area 57439 Attendorn
- Postcode area 57462 Olpe
- Postcode area 57482 Wenden
- Postcode area 57489 Drolshagen
- Postcode area 57518 Betzdorf
- Postcode area 57520 Emmerzhausen, Niederdreisbach, Steinebach
- Postcode area 57537 Wissen, Hövels u.a.
- Postcode area 57539 Fürthen
- Postcode area 57548 Kirchen (Sieg)
- Postcode area 57555 Mudersbach
- Postcode area 57562 Herdorf
- Postcode area 57567 Daaden
- Postcode area 57572 Niederfischbach
- Postcode area 57577 Hamm (Sieg)
- Postcode area 57578 Elkenroth
- Postcode area 57580 Gebhardshain
- Postcode area 57581 Katzwinkel (Sieg)
- Postcode area 57583 Nauroth
- Postcode area 57584 Scheuerfeld
- Postcode area 57586 Weitefeld
- Postcode area 57587 Birken-Honigsessen
- Postcode area 57589 Pracht
- Postcode area 57610 Altenkirchen (Westerwald)
- Postcode area 57612 Birnbach
- Postcode area 57614 Steimel
- Postcode area 57627 Hachenburg
- Postcode area 57629 Malberg, Norken, Höchstenbach u.a.
- Postcode area 57632 Flammersfeld
- Postcode area 57635 Weyerbusch
- Postcode area 57636 Mammelzen
- Postcode area 57638 Neitersen
- Postcode area 57639 Oberdreis
- Postcode area 57641 Oberlahr
- Postcode area 57642 Alpenrod
- Postcode area 57644 Hattert
- Postcode area 57645 Nister
- Postcode area 57647 Nistertal, Enspel
- Postcode area 57648 Unnau